Improvement in double-transmitting printing-telegraphs



GEQRGE LANDERS. Y Improvemen En Double Printing Telegraph@ Nol-120,019..A Pp/I v Patented uct. 17,1g1r.

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UNITED S'rmrns rEnPr @Enron GEORGE L. ANDERS, OF BOSTON, ASSIGNOR TO HIMSELF AND E. B. WELCH, OF CAMBRIDGE, MASSACHUSETTS.

IMPROVEMENT IN DOUBLE-TRANSMITTING PRINTING-TELEGRAPHS.

Specification forming part of Letters Patent No. 120,019, dated October 17, 1871.

To all whom it may concern:

Be it known that I, GEORGE L. ANDERS, of Boston, in the county of Suffolk and State of Massachusetts, have invented certain Improvements in Double-Transmitting Printing-Telegraph Instrument, of which the following is a specification Figure l is a plan view of an electric printingtelegraph-instrument embodying my invention. Fig. 2 is an elevation of the same.

My invention consists in arranging the parts of a printing-telegraph instrument, and the transmi'ssion ot electric currents, so as to effect the transmission of two messages simultaneously over one wire; and my invention consists, further, in the arrangement of two printing apparatuses in one instrument, and their magnetic attachment included in one circuit.

Referring to the drawing, a is the base of the telegraph-instrument, upon which is placed the permanent magnet b; also, electro-magnet c, responding to the positive current, and magnet el to the negative one, and actuating the levers e c', which are pivoted to standard f. h represents the type-wheel shaft, and fi the spindle which sets the sliding plate in motion. Both shafts are shown as broken ott', but should be connected with the inotor-commutator and key-board of a-'teleg aph-machine. The wires lc k connect the magnets with the ground G, and the wires l I! with the line L. The type-wheel t is mounted upon shaft h, and revolves about the center of the upper platform. The type-wheel is provided, on its periphery, with thirty letters or ciphers, and moves correspondingly and in exact positions to a type-wheel on a like instrument at the distant station. To the upper portion of spindle 'i is secured a crank or eccentric, n, which transmits a reciprocating motion to a slide-plate, o, in such amanner that for every revolution ofthe type-wheel the spindle i accomplishes thirty revolutions, and therefore thirty double oscillations of slide-plate o. There is another sliding plate, p, on top of plate 0, which, when a current is passing through magnets c and d, is locked with the sliding plate o, the lengthof the stroke, however, being terminated by catches s s', pivoted to plate p, and when lowered, resting against stops a u', and then compelled to follow the motion ot' sliding' plate o; but when raised, they become free of said stops. To plate p are attached two presses, o o', which hold the paper against the type-wheel, and pins w w', which vibrate the bell-crank levers a' x', to the longer arm of which are fastened feed-plates, when an impression is desired. The catches s s are raised -or lowered by means of slots, y yf, and levers, e

c', as the armatures are attracted or repelled by the currents in the electro-magnets; but while the one is affected only by the positive current, the other is sensitive only to the negative one. z z" are the paper strips on which the messages are to be imprinted.

A positive electric current is supposed to be transmitted from the distant station, the armature of lever c being drawn down and the other end raised, throwing catch s from stop a, and causing sliding plate o to act upon plate p so a-s to throw, by means of pin'w, bell-crank lever a toward one of the presses o, and feeding astrip of paper toward the type-wheel, where it is to be held by press o to receive the impression of the selected letter. When two of these instruments are suitably connected together, the commutator of one instrument will transmit positive currents and atfect the operation of the presses responding to positive currents in both instruments, and the commutator of the other instrument will transmit negative currents and effect the operation of the presses responding to negative currents. Thus all the letters of one message are selected from the type-wheels by negative electric pulsations, and the letters of the other messa-ge are selected by currents of a positive polarity.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The transmission of electrical currents in one circuit, a current in one direction securingA alents, attached to one or more type-Wheels in a instrument, by means of one circuit, substantially printing-telegraph instrument operating,` in one as set forth.

circuit, substantially as set forth. In testimony Whereo- I have signed my name 4. The use of two strips ofpaper, or their equivto this specification in the presence of two subalent, on a prililting-telegraph instrument, subserbing witnesses.

stantially as shown and described. Witnesses: GEO. L. ANDERS.

5. The printing' of two separate and distinct CARROLL D. WRIGHT, messages simultaneously, in a printing-telegraph NA'rH. BREWER, Jr. (50) 

